Geodesic
The character of the spectrum of quadratic quantum Hamiltonians
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1985), pp. 68-69 
M. A. Zaretskaya. The character of the spectrum of quadratic quantum Hamiltonians. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1985), pp. 68-69. http://geodesic.mathdoc.fr/item/IVM_1985_5_a12/
@article{IVM_1985_5_a12,
     author = {M. A. Zaretskaya},
     title = {The character of the spectrum of quadratic quantum {Hamiltonians}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {68--69},
     year = {1985},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1985_5_a12/}
}
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